N-Tier Architecture

N-tier architecture is also called multi-tier architecture because the software is engineered to have the processing, data management, and presentation functions physically and logically separated.  That means that these different functions are hosted on several machines or clusters, ensuring that services are provided without resources being shared and, as such, these services are delivered at top capacity.  The “N” in the name n-tier architecture refers to any number from 1.

References

What is N-Tier Architecture? How It Works, Examples, Tutorials, and More

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